Image data compression method using a run prediction technique

Details Image data compression method using a run prediction technique Image data compression method using a run prediction technique

1990-12-19

1992-02-25

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

3582611, 3582612, G06K 936, H04N 141

Patent

active

050919776

ABSTRACT:
In an image data compression method to be employed in coding digital image data whose pixels are represented by n bits and which include 2.sup.n different types of runs, while a run length of a current run is counted, a value representing a run type of the current run is predicted. The prediction is repeated till a predicted value coincides with an actual value of the run type of the current run. When a predicted value does not coincide with the actual value of the run type of the current run, a run length for an imaginary run having the predicted value is regarded as zero and the run length 0 of the imaginary run is entropy coded. On the other hand, when a predicted value coincides with an actual value, the actual run length of the current run is entropy coded.

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P. A. Stern et al., Facsimile Run Length Coding Uning Run Length Prediction (1974, pp. 170-176).
H. Shimora et al., "The Multi-Level Image Data Compression," Ricoh Technical Report No. 13, May 1985, pp. 13-21.

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